<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    let today = prompt('请你要输入星期几')
    switch(today){
      case '星期一' :
        alert('Monday')
        break
        case '星期二' :
          alert('Tuesday')
          break
       case '星期三' :
            alert('Wednesday')
            break
      case '星期四' :
              alert('Thursday')
              break
       case '星期五' :
              alert('Friday')
              break
      case '星期六' :
        alert('Staurday')
        break
      case '星期日' :
        alert('Sunday')
        break
        default :
        alert('请输入正确的数字')
    }
  </script>
</body>
</html>